First of all, it can be determined that the impact of furnace loading on crystal pulling is very large. The following are some of the points that I personally summarize through practice.The effect of furnace loading on the quality of single crystal, the process hygiene of the furnace, it is well known that the requirement of process hygiene for single crystal growth is very high, so the sanitary connection of the furnace affects the quality of the single crystal, for example, graphite pieces are not Cleaned up, oxides are not cleaned will directly affect the oxygen content of the single crystal.
The influence of furnace loading on crystal pulling, the rationality of loading furnace, in other words, whether it is to install the furnace according to requirements, whether the upper middle and lower thermal insulation barrels are close together, whether the heater, the three-petal pot and the heat preservation cover are axisymmetric. Temperature measurement hole, whether the vent hole is aligned with / in the middle. Whether the furnace bottom cover seals are tight. Whether the configuration of the thermal field is reasonable.
All of the above details directly affect the stability of the crystal pulling temperature, the normal operation of the furnace auxiliary equipment (such as the temperature measurement hole is not accurate) and the sealing performance of the single crystal furnace, which has direct direct to the crystal pulling environment. The impact is the key to determining whether or not to crystallize.
For an experienced operator, it is entirely possible to make a basic judgment on the thermal field by means of the crystal pulling condition of the previous furnace or several furnaces and the condition of the furnace, which is commonly known as the abnormal crystal pulling, so that By installing a furnace, it is possible to avoid the influence of factors that cause crystallization, and to improve the food production line formation efficiency.
